(19)
(11) EP 2 869 092 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.09.2015 Bulletin 2015/40

(43) Date of publication A2:
06.05.2015 Bulletin 2015/19

(21) Application number: 14189724.9

(22) Date of filing: 21.10.2014
(51) International Patent Classification (IPC): 
G01V 1/38(2006.01)
 G06T 7/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 30.10.2013 US 201361897544 P
19.02.2014 US 201414183615
30.04.2014 US 201414265539

(71) Applicant: PGS Geophysical AS
0216 Oslo (NO)

(72) Inventors:
  • Ursin, Torbjørn
    0490 Oslo (NO)
  • Malling, Michael
    0284 Oslo (NO)
  • Drange, Geir Andre Motzfeldt
    1388 Borgen (NO)

(74) Representative: Skone James, Robert Edmund 
Gill Jennings & Every LLP The Broadgate Tower 20 Primrose Street
London EC2A 2ES
London EC2A 2ES (GB)

   


(54) System and method for underwater distance measurement


(57) At least some of the exemplary embodiments are a method. The method includes obtaining (1004), at an underwater imaging device, a stream of images of geophysical surveying equipment, wherein the geophysical surveying equipment includes a target pattern having a calibrated image size. The geophysical surveying equipment is tracked (1012) using the image stream and the target pattern. The method further includes capturing (1014) from the image stream, a single image of the images of the geophysical surveying equipment, wherein the single image comprises an image of the target pattern having an apparent size. Based on the calibrated image size and the apparent size, a distance between the underwater imaging device and the geophysical surveying equipment is determined (1018).







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